From: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Date: Wed, 22 Jun 2016 13:13:45 +0000 (+0200)
Subject: i965/vec4: don't copy propagate misaligned registers
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=b9cd3f5b493e6fe835f1a3a2216f29bc0a4a2a93;p=mesa.git

i965/vec4: don't copy propagate misaligned registers

This means we would copy propagate partial reads or writes and that can affect
the result.

Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
---

diff --git a/src/mesa/drivers/dri/i965/brw_vec4_copy_propagation.cpp b/src/mesa/drivers/dri/i965/brw_vec4_copy_propagation.cpp
index 9b76f58fc67..e7f6f93f8bd 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_copy_propagation.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_copy_propagation.cpp
@@ -354,6 +354,9 @@ try_copy_propagate(const struct gen_device_info *devinfo,
       return false;
    }
 
+   if (inst->src[arg].offset % REG_SIZE || value.offset % REG_SIZE)
+      return false;
+
    bool has_source_modifiers = value.negate || value.abs;
 
    /* gen6 math and gen7+ SENDs from GRFs ignore source modifiers on